Pipeless furnace



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APPLICATION FILED NOV-12,1919.

Patented July 18,

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Milli its sates oHARLns' fBULLnRfor MILWAUKEE, wIscoNsIN, ASSIGNOR to L.J'. MUELLER FUR ACE COMPANY, or MILWAUKEE, w1sooNs1N, a CORPORATION orwrs- CONSIN.

rIrnLEss FURNACE.

Specification of Letters Patent.

Patented July 18, 11922.

Application filed November 12, 1919. Serial No. 337,553.

To aZZ whom it may concem Be it known that 1, CHARLES M. BUL ER, acitizen of the United States, and. resident of Milwaukee, in the countyof Milwaukee and State of Wisconsin, have inventednew and usefulImprovements in Pipeless Furnaces, of which the following isa'descri'ption, reference being had to the accompanying drawings,fwhichare a part of this specificatlon.

The present invention relates to certaln new and useful improvements inheating furnaces of the hot air conductor type in which cold and hot airducts have coincidentte'rminals above the heater, and refers moreparticularly to the furnace section or dome connecting the heat chamberproper with the terminal. I

As the dome sections connectingthe heat chamber proper with the terminalare generally substantially cone-shaped it has been the custom toconstruct the same by means of a strip of metal cut'in an are so thatwhen the ends thereof are brought together they will form a'tubularsection having inclined walls. This method of constructing the sectionsis extremely unsatisfactory as there is a considerable wastage ofmaterial due to the cutting of a blank on an arc, and with this in mindmy invention has for one of its objects to provide a furnace section ofthe class described, so constructed as to eliminate all wastage.

Another object of my invention 'is to 'provide a furnace sec-tion of theclass described which'will be formed from a substantially rectangularsheet or blank of material crimpedor plaited to give the desiredinclination to the'walls and at the same time substa'ntially reinforcethe same.

A further object of this invention is to provide a furnace section ofthe class de scribed employing two complementary sections constructed asdescribed and nested to provide a hot air passageway surrounded by adead air space. i

A still further object of the present invention is to provide a furnacesection of the type described in which the section is readilyinterchangeable with furnaces of the 50 same type of various sizes, andwhich will be of simple construction and extremely inexpensive toproduce.

With 'the above and other objects in view which will appear as thedescription proceeds, my invention resides in the novel construction,combination and arrangement of parts, substantially hereinafterdescribed and more particularly defined by the appended claims, it beingunderstood thatsuch changes in the precise embodiment of the hereindisclosed invent-ion may be made as come within the scope of the claims.

D In the accompanying drawings 1 have illustrated two complete examplesof the physical embodiment of my invention constructed according to thebest modes I have so far devised for the practical application of theprinciples thereof, and in which:

F 1g. l is a sectional view through the upper portion of a heatingfurnace employing my novel form of furnace section providing a hot airpassageway.

F ig; 2 is asectional view taken through my novel form of furnacesection on the line 2-2 of Fig. 1.

ig. 3 is an enlarged fragmentary view takenon the line 33 of Fig. 2.

Fig. 4 is a. plan View of rectangular blank employed in forming thefurnace section.

Fig. 5 is a side plan view of a slightly modified form of my furnacesection.

Fig. 6 is an enlarged fragmentary sectional view taken through a portionof the upper half thereof on the line 66 of Fig. 5, and I Fig. 7 is atop plan view thereof.

As illustrated the furnace is of well known type wherein the heater issurrounded by casings constituting two chambers, one the hot air chamberfor conducting the hot air upwardly, and the other, a cold air chamberfor conducting the cold atmosphere downwardly and communicating with thehot air chamber at the base thereof.

A drum including two spaced apart casings 10 surround the heater (notshown) and have their upper ends retained in spaced relation by means ofan upper ring or hook ll centrally provided with a laterally eXtend ingannular rib or re-inforoing flange 12 having a plurality of U-shapedmembers 13 engaging the inner casing 10 as best shown in Fig. 2.

The drum formed by the casings 10 provides a heating chambersurrol'lnding the heater (not shown) and said heating chamand'is formedof two complementary sections 19 each formed from a single sheet orrectangular blank of material 20 the ends of which have been securedtogether to provide a plain open ended cylinder which is then placed ina stamping machine and ribbed or plaited as at 21 whereby the walls areinclined upwardly and inwardly. The ribs 21,, besides giving the desiredshape to the sections 19, form re-inforcing means for the drum as willbe at once apparent. The upper smaller ends of the sections are beadedas at 22 and the portions above the beads 22 are directed upwardly in a.straight line as at 23 for'receivino' the lowerend of the pipe 18, thebeads 22 limiting the engagement. of said pipe with the drum sect-ion.The lower ends of the section 19 are struck laterally and thendownwardly as at 24 to provide flanges for engaging the annular ring 11.

The dome 16, as before stated, consists of two of the sections 19 nestedtogether as best shown in Figs. 1 and 2 whereby a stronger structure ishad having the walls thereof separated 'by a dead air space 25. The deadair space 25 is provided by the head 22 of the innermost section 19abutting the adjacent wall portion of the outermost section 19,preventing the walls of the same from engaging, ant the downwardlyextending flanges 24 of the sections are engaged, as shown in Fig. 2.The top edge of the portion 23 of the outmost section 19 is preferablyturned inwardly a slight distance for convenience in fitting the pipesection 18 thereon.

Heretofore, it hasbeen common practice to form the dome 16 from a blankof material so cut that when its ends are brought together and rivetedor otherwise secured, a dome is formed provided with upwardly andinwardly inclined walls. This method is extremely wasteful in materialin that, to cut the blank in the desired shape. the longitudinal edgesof the blank must be curved. and consequently when out from a sheet ofmaterial of a given size, the number obtained from one sheet is greatlyre-- duced and the material cut away is a complete loss, being of no usewhatsoever.

Consequently one of the main advantages obtained by my method of formingthe dome 16, is that the waste of material is practically nil, and agreat number of blanks may be cut from a single sheet of material. Ashereinbefore described I form the dome 16 from a single blank ofmaterial of rectangular form which may he of one piece or of severalpieces secured together, to form a plain cylindrical caslng which isthen plaited or ribbed to provide the inclined walls. This methodofconstructing the dome 16 also provides a reinforced dome as will beobvious.

In Figs. 5, 6, and 7 I have employed a slightly modified form of myinvention in whichthe dome section has a lower portion similar to thattype of my invention described having inclined walls and has an uppersection of rectangular shape for engagement with a rectangular pipe orelse which may be adapted to receive directly the grating 17.

What 1 claim for my invention is:

1. A section for a heating furnace consisting of a tapered tubularcasing having longitudinally extending reinforcing plaits in spacedrelation, the plaits at the end of the casing of less size being ofgreater width than at the other or larger end of the casing, said casinghaving a medial circumferentially extending rib and an end flange.

2. A section for a heating furnace consisting of a tapered tubularcasing having longitudinally extending reinforcing plaits in spacedrelation, the plaits starting adjacent the larger end of the casing andgradually increasing in width towards the end of the casing of lesssize, said casing having a medial circumferentially extending rib and anangular end flange.

3. A section for a heating furnace consisting of a tapered tubular,casing having longitudinally extending reinforcing plaits in spacedrelation, the plaits starting adjacent the larger end of the casing andgradually increasing in width towards the end of the casing of lessdiameter, said casing having a circumferentially extending rib near itsend of smaller size and an outwardly and downwardly extending flange atits end of larger size.

4. A section for a heating furnace consisting of two tapered tubularcasings having longitudinally extending reinforcing plaits in spacedrelation, the plaits starting adjacent the larger ends of the casingsand gradually increasing in width towards the ends ofthe casings oflessdiameter, said casings having circumferential ribs near theirends'of smaller size and also having outwardly and downwardly extendingflanges at their ends of larger size. one of said casings extendingaround the other in spaced relation with theflanged portions in intimatecontact, the opposite ends of the casings also being in engagement witheach other and with the outer casing contacting with the annular rib ofthe inner casing.

5. A section for heating furnaces, comprising two complementary casings,longitudinally extending plaits formed in each casing to formreenforcing ribs and inclined Walls, a circuniferentiaily extending ribformed in each casing near one end, and a flange formed on each casingnear the other end, said casings being nested and the rib of the innercasing retaining the intermediate wail portions of the casing in spacedrelation and the flange of the outer casing; abutting the flange of theinner casing to provide an air space therehetween closed at both ends.

In testimony whereof, I affix my signature.

CHARLES M. BULLER.

